Alright R3V. Im 80% stumped. (Now 90%) New development

[Wishno87]

Know where I can get one of those? Any old auto parts store? If it does show to be the harness upstream of the injector harness I have a harness I can use.

[Ryann]

Know where I can get one of those? Any old auto parts store?

Probably. They're sold under a few different brands including OTC.

http://www.otctools.com/distributors/index.php

[Wishno87]

I couldn't find a place that would sell me one so I rented out a set. I will probably buy one after though. Going out right now to see what happens.

[Wishno87]

Short in wiring(or elsewhere) causing that batch of injectors to stay permanently on.

We have a winner.

Used the light on the injector harness and the results were as follows:

Cyl 1: Clear and distinct flashing
Cyl 2: Solid and ON all the time with periodic brown outs but never went completely out
Cyl 3: Clear and distinct flashing
Cyl 4: Solid and ON all the time with periodic brown outs but never went completely out
Cyl 5: Clear and distinct flashing
Cyl 6: Solid and ON all the time with periodic brown outs but never went completely out

So at this point I have deduced that it is somewhere between the harness side of the C191 and the ECU.

Any advice for me? Anything else I can test first? I really don't want to tear this girls car apart unless I absolutely have to. This thing is the freshest E30 i have ever worked on.

[LuckyHenriksen]

Dang, I have a vert with the same symptoms, and am really not looking forward to swapping out harnesses :(

[Ryann]

Since you've already tried swapping DME's, in my mind you know it's got to be in the harness between the DME and injector harness. Check for pinch points or wear spots?

[Wishno87]

Dang, I have a vert with the same symptoms, and am really not looking forward to swapping out harnesses :(

Really? All the same symptoms? Even bank or odd bank? Maybe we can do tandem harness swaps haha

[Wishno87]

Since you've already tried swapping DME's, in my mind you know it's got to be in the harness between the DME and injector harness. Check for pinch points or wear spots?

Ya im pretty certain at this point. Im guessing the vibration wore off the coating somewhere and it finally grounded while she was driving to the picnic. I guess I'm just second guessing myself because I don't believe in my own skills enough to believe i have gotten myself to the core of this onion :?

[Wishno87]

I guess unless someone else has any other tricks up their sleeve im going to start removing the engine harness until I either find a break or exposed wire or have it all removed. At which point I will take the harness from the 90 and install that one.

[Ryann]

Dig, Wishno, DIG!

[blueapplesoda]

The harness is easy to remove and install. You can't really mix anything up besides the CPS and the Pulse sensor plugs. Do eet.

[matt0300]

Did u check all ur eccentrics to see if they were all there as well?

[LJ851]

Did u check all ur eccentrics to see if they were all there as well?

Reread post #34.

OP. Do you have a wiring diagram for E30? I would start with some continuity tests first to isolate where the problem is. If the car will stay running you also can fairly aggressively bend the harness back and forth all up and down it's length to see if you can make a difference (temp. un-short it) to help pinpoint the offending area.

[Wishno87]

Well I have a bentley but thats about it. So is it safe to say that the reason why I could pull the plug wires on those cylinders is because fuel was just being dumped in at such a rate that the plug would not fire? Wouldn't it just run really rich rather than quit completely? I pulled a plug and grounded it and confirmed that I had spark on those cylinders. Just a little confused about that.

[LJ851]

Well I have a bentley but thats about it. So is it safe to say that the reason why I could pull the plug wires on those cylinders is because fuel was just being dumped in at such a rate that the plug would not fire? Wouldn't it just run really rich rather than quit completely? I pulled a plug and grounded it and confirmed that I had spark on those cylinders. Just a little confused about that.

Yes, your fuel injectors would literally be wide open, pouring fuel into the cylinders. WAY too rich to fire, a stock injector is prob capable of what 180hp? How many horses is that motor making at idle? 20? 30?